GHA CI: revert "[CI Ubuntu] Strip installed components"

For tester convenience, the binaries should ship with debug symbols.
This reverts commit b8aa9e5609.

.github/workflows/ci_ubuntu.yaml

@@ -81,7 +81,7 @@ jobs:
           cmake --build build --target qbt_update_translations
           cmake --build build
           cmake --build build --target check
-          DESTDIR="qbittorrent" cmake --install build --strip
+          DESTDIR="qbittorrent" cmake --install build
 
       - name: Build qBittorrent (Qt6)
         if: ${{ startsWith(matrix.qt_version, 6) }}
@@ -100,7 +100,7 @@ jobs:
           cmake --build build --target qbt_update_translations
           cmake --build build
           cmake --build build --target check
-          DESTDIR="qbittorrent" cmake --install build --strip
+          DESTDIR="qbittorrent" cmake --install build
 
       - name: Prepare build artifacts
         run: |